منابع مشابه
Oxygen gradients in the microcirculation.
As arterialized blood transits from the central circulation to the periphery, oxygen exits through the vessel walls driven by radial oxygen gradients that extend from the red blood cell column, through the plasma, the vessel wall, and the parenchymal tissue. This exit determines a longitudinal gradient of blood oxygen saturation whose extent is inversely related to the level of metabolic activi...
متن کاملOxygen exchange in the mesenteric microcirculation of the dog.
The relationships of O2 tension in mesenteric lymph (PmlO2) and mesenteric venous blood (PmvO2) to intestinal O2 delivery/O2 consumption (DO2/VO2) were examined after graded hemorrhage (10 dogs), stepwise increments in FIO2 (4 dogs), and regional infusion of papaverine (2 mg/min or IV glucagon (25 microgram/kg) (4 dogs). Measurements included superior mesenteric arterial flow (SMA-Q), PaO2, Pml...
متن کاملOxygen pressure gradients in isolated cardiac myocytes.
Intracellular oxygen pressure within intact isolated cardiac myocytes is studied as a function of steady state extracellular oxygen pressure. The fractional saturation of myoglobin with oxygen is used to report sarcoplasmic oxygen pressure. The fractional oxidation of cytochrome oxidase, the fractional oxidation of cytochrome c, the rate of respiratory oxygen uptake, and lactate accumulation ar...
متن کاملErythrocytes Are Oxygen-Sensing Regulators of the Cerebral Microcirculation
Energy production in the brain depends almost exclusively on oxidative metabolism. Neurons have small energy reserves and require a continuous supply of oxygen (O2). It is therefore not surprising that one of the hallmarks of normal brain function is the tight coupling between cerebral blood flow and neuronal activity. Since capillaries are embedded in the O2-consuming neuropil, we have here ex...
متن کاملMicrovascular and tissue oxygen gradients in the rat mesentery.
One of the most important functions of the blood circulation is O2 delivery to the tissue. This process occurs primarily in microvessels that also regulate blood flow and are the site of many metabolic processes that require O2. We measured the intraluminal and perivascular pO2 in rat mesenteric arterioles in vivo by using noninvasive phosphorescence quenching microscopy. From these measurement...
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ژورنال
عنوان ژورنال: Acta Physiologica
سال: 2011
ISSN: 1748-1708
DOI: 10.1111/j.1748-1716.2010.02232.x